Description
NS hollow stopper with short ground joint NS 29/22 is a hexagonal glass stopper intended for reliable closure of laboratory apparatus fitted with standard ground joints. Produced from borosilicate glass 3.3, the stopper is hollow and flat, combining light weight with mechanical stability for routine chemical and analytical work. The short-ground NS 29/22 configuration ensures a secure, leak-resistant fit on matching flasks, condensers and adapters while remaining easy to insert and remove. Its hexagonal head provides a firm grip for gloved hands and simplifies orientation during assembly. Net weight is only 0,028 kg, making the component convenient for frequent handling and storage. This stopper from manufacturer Witeg is supplied as a single piece and suits everyday sealing tasks in synthesis, distillation and sample preparation where chemical resistance and thermal durability of borosilicate glass 3.3 are required. The design supports clean, reproducible joints without additional sealing media under normal laboratory conditions.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Joint size: NS 29/22
- Material: Borosilicate glass 3.3
- Design: Hollow, flat, hexagonal
- Ground joint type: Short
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Questions about ST-hollow stoppers, short joint ST 29/22
What is this article?
ST-hollow stoppers, short joint ST 29/22 is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Ground-joint glass stoppers, inside Stoppers, caps & closures, in Labware.
A ground-glass stopper matches a ground neck of a stated joint size. A 14/23 stopper does not seal a 29/32 neck. The stopper is part of the flask's seal, and a chip on the grind is a leak.
A closure is the part that decides whether a bottle stays shut and whether the contents attack the seal. A ground-glass stopper matches a ground neck. A screw cap needs the right thread and a liner that survives the liquid. Rubber and silicone stoppers push into a mouth. The liner, not the colour of the cap, is the chemical choice. The vessels they close are indexed under ISO laboratory glassware.
Which category should I open next?
The category is Stoppers, caps & closures. The sub-category is Ground-joint glass stoppers. The catalogue is Labware.
Shelves beside this one are Screw caps & closures, Rubber & silicone stoppers, Lids & seals and Closures (other).
What should I check before I order?
When this page shows a safety data sheet, use that manufacturer file. Hazard text does not belong in the sales description. For a pack size, a grade or a certificate that is not on the page, send a quote request or contact the team.
How does ordering and shipping work?
Luminix Health distributes this article from the heart of Europe. Articles in stock ship within 2–5 business days. Standard delivery is free from €250 excl. VAT. Cold-chain goods and dangerous goods under ADR are never included in that free delivery. The terms are in the Shipping Policy. The full brand index is on shop by brand. Who we are is on about us.
Which other categories should I open?
The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.